It's acting up again. Was working fine, the issue I started here lasted about a week then. Yesterday (Sept. 23) was one of the best days in a long time and look on the number of visits.
Ramp on 19th is natural, not an error.
The drop on 23rd seems like Omniture fluke or we had conversion 30% and people would be browsing 2.5x more items than people day before. I increased marketing on Saturday 19th did only minor tweaks since.
Seems that Omniture has issue recognizing "visit" and we should be looking at PageViews instead of Visits. In this case it shows 100 people and 1200 pageviews on 23rd. Even on our website, where people are not distracted by other listings, we get only 8.5/visit average and two days before 23rd were consistent 4.5 pages/visit, so sudden 12pages/visit is highly unlikely.